<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="add"/>
    </div>
</template>

<script>
  import {nanoid} from "nanoid"
  export default{
      name: 'MyHeader',
      methods:{
        add(event){
          //校验数据
          if(event.target.value.trim() === '')return alert('输入不能为空')
          //包装对象
          const todoObj = {
            id:nanoid(),
            title:event.target.value,
            done:false
          }
          //向父组件传值
          this.$emit('receive', todoObj)
          //清空输入
          event.target.value=''
        }
      }
  }
</script>

<style scoped>
  /*header*/
  .todo-header input {
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 7px;
  }

  .todo-header input:focus {
    outline: none;
    border-color: rgba(82, 168, 236, 0.8);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
  }
</style>